Pump jack



NOV 30, 1937. w p HEFFERNAN v 2,100,509

PUMP JACK Filed April 20,1937 2 Sheets-Shet 1 F] 40 y 19 x v I J K Nov. 30, 1937. wjP. HEFFERNAN 2,100,509

PUMP JACK Filed April 20, 1957 2 Sheets-Sheet 2 Patented Nov. 30, 1937 UNITED STATES PUMP JACK Wilford P. Hefiernan, Humble, Tex., assignor of one-fourth to Charles G. Eidson, Houston, Tex.

Application April 20,

7 Claims.

7 The present invention is a power pump jack, used, among other purposes, particularly in oil fields for transmitting power from a source to a reciprocating pump for raising and lowering the plunger thereof.

A great variety of pump jacks of this type have been employed but, so far as is known, none have been devised for applying a true vertically straight line motion to the plunger of the pump,

l which motion is essential and necessary to prevent wear, inefiicient and uneconomical operation. The pump rod or piston rod extending into the well should always be lifted vertically to prevent whipping, wear on the stuffing box and unnecessary strain onthe moving parts.

The principal object of this invention is the provision of a pump jack having a construction which will apply a truly vertically straight line motion to the pump rod from a remote source, such'as a substantially horizontal pulling cable, to vertically lift the pump plunger in the well by means of a pump rod which extends outwardly from the well.

Another object of the invention is the provision of a pump jack of the above stated character which has novel features of construction enabling adjustment of the jack to increase or diminish the stroke of the pump plunger without disassembling any of the parts of the jack or from the plunger.

Another object of the invention is the provision ofa pump jack having means which will permit adjustment of the parts of the jack while in operation for increasing or diminishing the power of the stroke and without disconnecting the jack from its source of power or from the pump.

Another object of the invention is the provision of a pump jack assembled in a self -contained unit ready to be set over a well and anchored thereto.

A further object of the invention is the provision of a pump jack having a construction permitting it to be serviced without moving the jack from its position, thus saving much time and labor.

With the above and other objects in view as will appear as the specification proceeds, the invention further resides in the sundry details of construction, combination and arrangement of parts hereinafter more fully described and pointed out in the appended claims.

1937, Serial No. 138,013

in place and connected with an oilpump, the pump and its connection to the jack being shown in dotted lines;

Fig. 2 is a top plan View of the jack sho wn i'n' Fig. Fig. 3 is a detail sectionalview' taken substantially on line 3-3 of Fig. 1;

Fig. 4 is a similar viewto-Fig. 1 but'showinga slightly modified form of the jack;

Fig. 5 is a front end view of the jack as shown in Figs. 1 and 4; and

Fig. 6 is a transverse sectional detail view-taken substantially on line 6-6 of Fig. 1-.

Referring in detail to the drawings in which like characters refer to similar and like parts throughout the several views, It] denotes a suitable base-for the jack, which base may comprise spaced longitudinal members a and I connected together by transverse cross membersc and d of such number and construction as may be, neces-' sary or desired. Suitably mounted, and secured tothebase ID, at a medial portion thereof, are, a pair'of spaced tubular guides If; and preferably as shown in the'drawings, guides are mounted on said members a and b respectively of the base and arranged in transverse alignment. These guides Il may be suitably braced to the base, as shown, by rods I2 and I3 and at their upper end portions by a transverse rod [4 which latter connects the. two guides II. A pair of guide rods l5v are slidably disposed'in each of the tubular guides llv respectively, and'extend from the upper ends of the, latter for a desired distance in their normal lowered position. The guide rods l5, preferably, have a sliding fit in the tubular guides l l by pro viding a bearing collar [6 at the. upper ends of the tubular guides ll betweenv the latter andthe guide rods I5; and the guide rods l5 may be provided on their lower ends with. a similar bearing collar I 6 having a piston-like fit with theinterior Walls of the tubular guides II. The oilmay be, and preferably is, contained in the lower ends of the tubular guides H to form a dash-pot or cushion for. the guide rods and, further, for en.- abling self-lubrication of the surfaces 7 of the guide and guide rods. v

A pump lifting beam ll is connectedsubstantially intermediate its ends to the upper ends ofthe guide rods by any suitable means, such as 50 the transverse connecting pin or rod l8 and is, held in an inarticulate substantially horizontal position by means of; equalizing brace rods l9 disposed 'onopposite sides of: the. beamand. connectedto thejack-rocker, generally indicated: by

2 V I e e s V the numeral 20. A pitman rod 2| connects the beam I! with the jack-rocker 20 for imparting lifting movement to the beam [1.

The brace rods 19 preferably extend from the rear end of the lifting beam I1, where they are pivoted as at 40, to the forward end of r the jackrocker 20, where they are pivoted as'at 22. The pitman rod 2| is pivotally connected, as in bearing 23, to the forward end of the jack-rocker 20 and has its upper end similarly pivotally connected, as at 24, to the lifting-beam H, the pitman 2| being in a substantially vertical position as shown. I

The jack-rocker 20 may take any particular form provided it has the function of a bell-cranklever, but is here preferably disclosed as a rightangl-e-triangular frame having one'leg e thereof forming a normally horizontal arm and its other leg I providing a normally vertical arm, while the member g provides a brace for the members e and f and is disposed substantially co-incident with the hypotenuse of the triangles In actual construction the arm 6 is longer than the arm f, and is disposed in a cradle 25 at its end portion adjacent the apex of the arms 6 and, ,f. This; cradle25 is pivotally supportedat its rear end on the base of theframe, such as by a suitable roller or'bearing surface 26, disposed in a come plemental bearing 21 provided on the end crosspiece 01, as shown in Figures 1, 2, 3 and 5. The forward end of the cradle is provided with aligned openings 28 with which may be aligned openings 2? in the jack-rocker armc, and thru which openings a fastening pin 30 is disposed for connecting the arm with the cradle. Thus, it will be seen that the position of the jackrocker may be adjusted longitudinally in the cradle to vary its distance with respect to the pump P, to increase or decrease'in a general manner the extentof lift of the beam I] or to increase or decrease the leverage from the source of power to the lifting beam Iil. I

To permit a change in the leverage of the jackrocker 2D for increasing and decreasing the amount of vertical lift of the beam l7, while the pump jack is in operation, andv further to permit fine regulation of this adjustment, the lower line L (which is pulled to rock the jack-rocker 20 on its fulcrum 26 from a source not shown) is connected'with the vertical arm.] of the jackrocker 20 and slidable, at will, by suitable means, such as a feed screw 3| rotatably mounted in the upper portion, of the jack-rocker, as at 32, and which has a handle or other operating means 33 for rotating thescrew. -It ispreferred to provide a slide block 34. thru which the feed screw 3| is threaded. The slide block 34 has a shoe 3! thereon slidably bearing against the verticalarm f of the jack-rocker, as shown particularly in Figs. .1 and .6. A stirrup 38 is loosely carried by the slide block 34 and is held in place, by a. removable pin 39, thestirrup 38 being detachably'connected to the power pull line L.

It will thus be seen that whenever the line L is pulled by the usual power means (notshownl the jack-rocker 20 will fulcrum at 26 raising the beam l1 thru the pitman rod 2| but, by reason of its connection with the vertically movable guide rods l5 and with the equalizing bars l9 cooperating with the pitman rod 2|, the beam maintains an inarticulate position; thus imparting a true vertical reciprocating movement to the connecting rod 1' of the pump P.

When it is desired to effect a general adjustment of the jack-rocker with respect to" the while the jack is in operation, this may be ac-.

complished without dismantling the jack or discontinuing operation of the pump P by suitable ivertical adjustment of the slide block 34 by op- V eration of the adjusting screw 3|. Variation in lift caused by the screw 3| does not require any re-adjustinent of the equalizing bars l9, as above mentioned, in connection with adjustment in the cradle 25.

When it is desired to swing the pump rod connecting end a: of the beam ll clear of the'well,

V the bolt 2| is removed disconnecting the equalizer rods I9, thus. enabling the beam to be swung on the cross bargl8 in the dotted line position as shown in Fig, 1. V

' For some uses it may be desirable to eliminate the cradle-25 and the adjustment effected thereby, To this end there is shown in Fig. 4 a modifled form ofthe invention, in which parts corresponding to like parts throughout the other views just described have the same numerals raised by the exponent b and the same letter characters raised by the exponent prime Therefore, detail description of this modification need not be given in the interest ofconserving space; but suffice it,to say, that Fig. 4 is identical with the other views except that the arm e of the'jack-rocker 20 is directly fulcrumed at its inner'end portion by means of a roller 26 or the like disposed in bearing 21 and that the equalizing brace rods l9 are not provided with a plurality of openings I9. 7 a

Having thus described the invention and th manner in which-it is to -be performed, it is to be understood. that the invention is not tobe. restricted to the embodiments herein shown and described because it may take other forms and be modified in numerous respects which fall with in the scope of the appended claims. 7

What is claimed is:

V V l. A pump-jack comprising a lifting beam mounted in vertical guides, a jack-rocker, a connection between the jack-rocker and the lifting beam for raising and lowering the latter, said jack-rocker comprising a bell-crank-lever one end of which is connected with the lifting beamand by which and said guides the lifting beam is solely supported, the other end portion of said lever'being connectable to pull line.

2. A pump-jack comprising a 'lifting bea mounted in vertical guides, a jack-rocker including a bell-crank-lever one end of which is connected with the lifting beam and by which and said guides the lifting beam is solely supported,- the otherend portion of said lever being connectable to pull line, and means for adjusting the bell-,crank-lever with respect to itspoint of connection with said lifting beam.

3. A pump-jack comprising a lifting mounted in vertical guides, a jack-rocker including a bell-,crank-leverone end of which is connected with the lifting beam and the other end. of which isconnectable to a pull-line, means for adjusting the bell-crank-lever with respect'toits point of connection-with the lifting beam, as

slidable member on the arm of the'bell-cranklever connectable to the source of power and to which slidable member said pull line is attachable, and a feed screw carried by the jack-rocker and threaded in said slidable member, whereby said slidable member may be adjusted along the length of said arm at will.

4. A pump-jack comprising a base, vertical guide means mounted on the base, a substantially horizontal lifting beam pivotally mounted in guide means, a jack-rocker including a bell-crank-lever fulcrumed on the base, a pitman rod connecting one end of the bell-crank-lever to the lifting beam at one side of the beams connection to said guide means, equalizing brace rods connected to the beam on the other side of its connection to said guide means and to the said end portion of the bell-crank-lever, the other end of the bell-cranklever being connectable to a source of linear power whereby the jack-rocker is actuated.

5. A pump-jack as set forth in claim 4 further characterized by the fulcrum of the bell-cranklever comprising a cradle member in which the bell-crank-lever is longitudinally adjustably carried, and means for permitting adjustment of the equalizing brace rods to compensate for said adjustment of the jack rocker in said cradle member. 7

6. A pump-jack as set forth in claim 4 further. characterized by the end of saidbell-crank-lever connectable with a source of power having a sliding block mounted thereon to which a source of power is connectable, a feed screw mounted in said lever and threaded in said block, whereby the point of power connection with the bellcrank-lever may be adjusted at will along the length of said arm of the bell-crank-lever.

7. A pump-jack comprising a base, a pair of spaced vertical tubular guides mounted on the base, a guide rod in each of said tubular guides, respectively, a substantially horizontal lifting beam pivotally mounted on the ends of said guide rods intermediate its ends, a jack-rocker including a bell-crank -lever fulcrumed on the base, a pitman rod connecting one end of the bell-cranklever to the lifting beam at the forward end portion of the latter, equalizing brace rods connecting the other end of the beam to said end portion of the bell-crank-lever, the other end of the bellcrank-lever being connectable to a source of linear power, whereby the jack-rocker is actuated.

WILFORD P. HEFFERNAN; 

